package api;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import lombok.SneakyThrows;
import model.UserInfo;
import util.AppVar;
import util.DBUtils;
import util.ResultUtils;
import util.SessionUtils;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;

/**
 * 修改文章
 */
@WebServlet("/upart")
public class UpdateArticleServlet extends HttpServlet {
    @SneakyThrows
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        int data = 0;
        String msg = "未知错误！";
        // 登录权限效验
        UserInfo userInfo = SessionUtils.getLoginUser(req);
        if (userInfo != null) {
            // 1.得到前端的值并效验
            String title = req.getParameter("title");
            String context = req.getParameter("context");
            String aidStr = req.getParameter("aid");
            if (!StrUtil.isBlank(title) && !StrUtil.isBlank(context)
                    && !StrUtil.isBlank(aidStr)) { // 参数是正常的
                int aid = Integer.valueOf(aidStr);
                if (aid > 0) {
                    // 2.执行数据库的修改
                    Connection connection = DBUtils.getConnection();
                    String sql = "update article set title=?,context=? where aid=? and uid=?";
                    PreparedStatement statement = connection.prepareStatement(sql);
                    statement.setString(1, title);
                    statement.setString(2, context);
                    statement.setInt(3, aid);
                    statement.setInt(4, userInfo.getUid());
                    data = statement.executeUpdate();
                    // 关闭资源
                    DBUtils.close(null, statement, connection);
                    msg = "";
                } else {
                    msg = "参数中文章 id 有误！";
                }
            } else {
                msg = "参数不全！";
            }
        } else {
            msg = "请先登录！";
        }
        // 3.将结果返回给前端
        resp.setContentType(AppVar.RESPONSE_CONTENTTYPE_JSON);
        resp.getWriter().println(JSONUtil.toJsonStr(
                ResultUtils.toResult(200, data, msg)
        ));
    }
}
